What does code U0670 mean?

Q: What does code U0670 mean?

Lost Communication With Fuel Temperature Sensor A. U0670 is a generic network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the fuel temperature sensor designated as 'A'. The module that monitors this sensor, typically the engine control module or a dedicated fuel system controller, expects a periodic data message from the sensor and has not received it within the required time window, so it sets this code and may substitute a default fuel temperature value.

DTC codes / U06xx · Network communication / U0670

U0670Lost Communication With Fuel Temperature Sensor A

U0670 is a generic network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the fuel temperature sensor designated as 'A'. The module that monitors this sensor, typically the engine control module or a dedicated fuel system controller, expects a periodic data message from the sensor and has not received it within the required time window, so it sets this code and may substitute a default fuel temperature value.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.